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【单选题】
只能保证主电路中电源不发生短路，但操作不方便的正反转控制是 。A.
按钮互锁的电路
B.
接触器互锁的电路
C.
按钮、接触器双重互锁的电路
D.
基本正反转控制电路
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举一反三
【单选题】— Could you tell me ______? He is wanted by the head teacher. — Sorry, I've no idea. But he ______ here just now. [ ]
A.
where Tim was, was
B.
where is Tim, was
C.
where Tim is, was
D.
where Tim is, is
【单选题】—Are you free after school? —Sorry, I’ve planned to treat a friend of mine to dinner ______ for help.
A.
in order
B.
in return
C.
in turn
D.
in honor
【单选题】一You've left the light on. —0h, sorry. _____ and turn it off. [ ]
A.
I've gone
B.
I'll go
C.
I went
D.
I'm going
【单选题】当时间线上的颜色呈（ ） 时，表示过载区域，需要渲染；当时间线上的颜色呈 （ ）时，表示已经渲染。
A.
红色 绿色
B.
绿色 红色
C.
红色 白色
D.
白色 红色
【简答题】现代短跑技术的主要特征是什么? 2.跳远完整技术由哪几个部分组成?起跳的任务是什么?
【单选题】– Are you free after school? -- Sorry. I’ve planned to treat a friend of mine to dinner ___ for his help.
A.
in addition
B.
in turn
C.
in return
D.
in total
【单选题】---Are you free after school? ---Sorry, I’ve planned to treat a friend of mine to dinner___for his help.
A.
in trouble
B.
in fact
C.
in total
D.
in return
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