下列属于特种胶轮车的是（）。A、WC5型胶轮车 B、WC8型胶轮车 C、WC2型胶轮车D

在“用电流表测电流”的实验中，连接电路前首先应认真观察电流表，明确电流表的_______、电流表的最小刻度值及指针是否指在零刻度位置。在某次测量中，所使用的电流表的表盘示数及连接情况如图所示，则此时所测电路中的电流值是_________A。

单词填空，用括号内所给单词的正确形式填空。

1. Our beautiful classroom _______(clean) every day.

2. In order to improve Mary's self-confidence, her teacher asked her to look at _______(she) in a

     mirror every morning and say "I'm the best."

3. She was very _______(happy) to fail the final exam.

4. Here are _______(tomato) noodles. They smell good!

5. Trust him! He has no difficulty _______(work) out the problem.

6. Cleaners clean the street every day. Their work is _______(true) common.

7. More and more people all over the country are worried about food _______(safe).

8. Windy does _______(badly) in P.E. than me.

关于拓扑异构酶的说法哪项正确？（）

A.消除DNA解链时产生的扭曲张力

B.拓扑酶Ⅰ能切断DNA双链一股并再接，反应需要ATP供能

C.在复制时解开DNA的双螺旋

D.拓扑酶Ⅱ能使DNA双链同时断裂并使双链断端再接，反应不需要ATP供能

E.稳定已经解开的DNA双链

两臂同时做相同的动作或下肢依次做不同方向但相同的动作称为（）。

除尘风机、电机点检内容要求？