股票基金减少了基金经理投资的委托代理风险。（）

根据句意及首字母提示补全单词。

1. Fruit and crops are ripe. The farmers are busy h______ in fall.

2. It was raining last night. The ground is still w______.

3. —Jim, how long can I k______ this dictionary? —Two weeks.

4. I'm afraid it's going to rain. You have to take an a with you.

5.We can't see anything on the road this morning. It's f______.

6. He got h______ in that traffic accident.

7. In England the traffic k______ on the left side of the road.

8. I want to buy him a p______ for his birthday.

9. Look at the clouds of different s_______ in the sky.

10. He never talks to me. I don't know a_______ about him.

日常生活与化学有着密切的联系，在食盐、熟石灰、干冰、生石灰四种物质中，用化学式填写：可做食品干燥剂的是______，可用于人工降雨的是______，可用作调味品的是______，可用于改良酸性土壤的是______．

两根足够长的金属导轨竖直放置，间距为L，底端接阻值为R的电阻。将质量为m的金属棒悬挂在一个固定的轻弹簧下端，金属棒和导轨接触良好，导轨所在平面与磁感应强度为B的匀强磁场垂直，如图所示。除电阻R外其余电阻不计。现将金属棒从弹簧原长位置由静止释放，则

A．释放瞬间金属棒的加速度等于重力加速度g

B．金属棒的速度为v时，金属棒两端的电压U=BLv

C．金属棒的速度为v时，所受合外力的大小为F=

D．B球对轻杆做功

弩机是具有远射功能的木弩上边的铜质机件。

无线数传业务的纯流量PN套餐分为两类，分别是（）和大流量。

A.叠加流量

B.普通流量

C.小流量

D.纯流量