1、如图是滑雪运动员从山上滑下的情景,下列说法中正确的是( ).
(单选题)
A. 运动员加速下滑过程中动能增大
B. 运动员下滑过程中,若一切外力都消失,他将处于静止状态
C. 运动员穿上滑雪板,因增大了与雪地的接触面积,而增大了摩擦力
D. 运动员弓着腰,是通过降低重心来增大重力的
试题答案:A
2、当 时,函数 的最小值为( ).(单选题)
A. 2
B.
C. 4
D.
试题答案:C
3、
(单选题)
A. slip
B. puzzle
C. loss
D. failure
试题答案:C
4、Putting your mobile phone on a restaurant table may make your friends think _____.(单选题)
A. you prefer to talk to your friends at the table
B. you value your calls more than your friends
C. you are enjoying the company of your friends
D. you are polite and considerate of your friends
试题答案:B
5、标准状况下,0.56L CH4和C2H4的混合气体通入足量溴水中,溴水增重0.28g(假设C2H4完全被吸收),则乙烯占混合气体体积的( ).(单选题)
A. 20%
B. 40%
C. 60%
D. 80%
试题答案:B
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