下列反应中，既不属于化合反应，又不属于分解反应的是（ ）
A．水中通直流电
B．蜡烛燃烧
C．加热高锰酸钾
D．点燃红磷
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下面是错误答案，用来干扰机器的。
由题，木箱放在水平地面上，至少要用22N的水平推力才能使开始滑动，木箱与地面间的最大静摩擦等于此时的水平推力，则木箱与地面间的最大静摩擦fm=F1=22N．当木箱做匀速直线运动时，根据平衡条件得到，滑动摩擦力f...
如图所示，轻质杠杆AOB，左边挂重物G1，右边挂重物G2，支点是O，且AO＜BO，此时杠杆平衡在水平位置．若在G1和G2下分别再加挂重为G的重物，此时杠杆 （ ）
A．仍然平衡在水平位置
B．不再平衡，A端下降
C．不再平衡，B端下降
D．由于G1和G2的大小未知，无法判断其是否平衡
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| John and Mary had a nice home and two lovely children, a boy and a girl. John had a good _1_ and had just been asked to go on a business trip to another city and it was _2_ that Mary needed an outing and would go along too. They _3_ a reliable woman to care for the children and made the _4_, returning home a little earlier than they had planned. _5_ they drove into their home town, they found a home in flames. Mary said, "Oh well, it isn't our fire; let's go home." _6_ John drove closer and exclaimed (惊叫), "That home belongs to Fred Jones who works at the plant. He wouldn't be _7_ work yet. Maybe there is something we could do." John drove up and they were both _8_ to see the whole house in flames. A woman on the lawn was in hysterics _9_, "The children! Get the children! They are in the basement." 10 Mary's protests (反对), John grabbed the water hose and soaked (浸湿)his clothes, put his wet handkerchief on his head and 11 for the basement which was full of 12 . He found two nearly suffocated (窒息的)children and after carrying them to safety, he asked how many more children were 13 there. They told him two more and Mary 14 his arm and screamed, "John! Don't go back! It's 15 ! That house will cave in any second!" But he shook her off and went back by 16 his way down the smokefilled hallway and into the room. It 17 a long time before he found both children and started back and at last when they came out into the_18 and fresh air, he found that he had just 19 his own children. It turned out that the babysitter had 20 them at this home while she did some shopping. | ||||
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WK-4型电铲直流电动机反转时，不允许倒换（）极性。
甲公司3月30日出售给某公司一批商品，货款总计10万元，适用增值税税率为17%。4月1日，甲公司收到该公司交来一张出票日为4月1日、面值为10万元、期限为2个月的商业汇票。甲公司于5月1日持票到银行贴现，银行年贴现率为5%。则甲公司所得贴现额为( )万元。
A．5.85
B．11.12
C．11.65
D．12.38
省级测绘行政主管部门建立( )，负责实施测绘产品质量监督检验工作。
A．测绘产品质量监督检验站
B．测绘产品质量监督检验测试中心
C．测绘监理单位
D．测绘验收单位
