食品中亚硝基化合物含量最高的是A．肉类食品 B．鱼类食品 C．发酵食品 D．盐腌食物

填写下面空白：

（1）浓度对化学平衡移动的影响：增大反应物浓度或减小生成物浓度都会使平衡向_______（填“正”或“逆”）反应方向移动。增大生成物浓度或减小反应物浓度都会使平衡向_______（填“正”或“逆”）反应方向移动。

（2）温度对化学平衡移动的影响： 升高温度平衡向_______（填“放”或“吸”）热反应方向移动。降低温度平衡向_______（填“放”或“吸”）热反应方向移动。

（3）压强对化学平衡移动的影响：对于有气体参加的反应，增大压强（由于缩小容器的容积）平衡向气体体积_______（填“扩大”或“缩小”）的反应方向移动。减小压强（由于扩大容器的容积）平衡向气体体积_______（填“扩大”或“缩小”）的反应方向移动。

油品能发生自燃的最低油温称为（）。

A、燃点

B、闪点

C、点燃

D、自燃点

Come prepared: When you arrive at a race, your bike should be in race-ready condition.

Chain Management: Chain damage is still the number one problem with mountain bikes. Keeping your chain clean and well-oiled will help, as will frequent chain replacement. Periodic inspection of your chain for wear, stretch and damage may save you a long walk home.

Packing Tape: This can be used for rims trips, boots for fractured tires and a dozen more makeshift repairs. If you've flown to the race, it also saves you from having to borrow tape to close up your bike box for the flight home. Other musts: safety pins and plastic zip ties.

Pre-race: Visual inspections before any serious off-road ride, carefully examine the area where the tire hooks onto the rim and remove any foreign objects which could cause premature（比预期早的）tire wear.

Tire Pressure: Check tire pressure before race start. The recommended pressure is noted on the tire sidewall, usually 40 lbs., many racers run 50 lbs., or more for less rolling resistance.

Be Self-Contained: Make sure you are self-contained. Bring your own drinking water, food and first aid kit. Also have tools, spare parts, tubes, quick fills and a chain tool. Never suppose you can just borrow these items from a friend.

Post-race Visual Inspections: Inspect your bike after completing each event, especially before competing in a downhill event. Re-inspect before packing your bike for the trip home.

Have Fun!

73. This passage is written for those who _______.

A. go in for outdoor activities                        B. love cycling in other places

C. will join in mountain bike races                 D. are preparing for a marathon

74. The writer seems to advise the racers ________.

A. not to replace chain frequently                   B. not to take an extra chain

C. to bring less while racing                          D. to have higher tire pressure

75 The passage is organized in order of _______.

A. importance             B. time                      C. readers' interest       D. place

76. From the passage we can safely say that _______.

A. a foreign tire is a guarantee for the cyclist to win the race

B. the biggest trouble for the race is that nobody will help you

C. a downhill event causes more damage to the bike than an uphill one

D. regular inspection is a must before, during, and even after the race

并联电容器装置的合闸涌流值，宜取电容器组额定电流的（）倍。

A.5

B.10

C.15

D.20

下列合同不属于转移财产所有权类合同的是（）

A、房屋买卖合同

B、购销合同

C、赠与合同

D、土地使用权转让合同