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【单选题】
输入信号上升沿触发,一定时间后输出接通的定时器是( )。A.
SD
B.
SE
C.
SF
D.
SP
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举一反三
【单选题】—Was the housemaster strict?—Yes. He requested that we ______ television on week nights.
A.
not watch
B.
must not to stay
C.
not be watching
D.
staying not
【简答题】2 5 ×14× 15 28 4 5 ÷14 2 3 ÷ 1 3 × 5 7 ÷ 3 7 （ 1 3 - 1 6 ）× 2 3 3÷ 3 5 - 3 5 ÷3．
【简答题】试分析图 所示的简单道岔表示电路,是否符合“故障—安全”原则 ? 为什么?
【简答题】10 21 × 12 25 5 9 ÷10 25 36 ÷ 5 12 3 4 ×14× 5 7 4 5 ÷ 2 3 ÷ 5 6 1 13 ÷ 9 13 ×3．
【简答题】计算． 836÷4×2 687÷3-190 67+14×8 984÷2÷3．
【简答题】比较大小： ______－3. 14 (用“＜”或“＞”或“＝”连接)．
【单选题】He requested that all the soldiers _____ the news secret.
A.
keep
B.
kept
C.
keeping
D.
to keep
【简答题】试分析下图所示的简单道岔表示电路 (1)BJ是什么类型的继电器?(无极,有极,偏极,整流,时间等) (2)图中C有何作用? (3)图中二极管有何作用? (4)是否符合“故障—安全”原则?为什么?
【单选题】He had no sooner arrived there ________ pestering his doctor.A．and then he beganB．when he beganC
A.
34. He had no sooner arrived there ________ pestering his doctor. A．and then he began
B.
when he began
C.
to begin
D.
than he began
相关题目：
【单选题】He requested that all the soldiers _____ the news secret.
A.
keep
B.
kept
C.
keeping
D.
to keep