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【单选题】
555定时器构成的单稳态触发器单稳态脉宽由（ ）决定。A.
输入信号
B.
输出信号
C.
电路电阻及电容
D.
555定时器结构
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【单选题】听力原文：Hello, Frank, this is Jane speaking. Do you remember Lucy's birthday? It is October the 16th, on Sunday. We are going to have a party for her and give her a great surprise. Would you like to plan...
A.
Because they are close friend.
B.
Because they are classmates.
C.
Because Lucy will graduate from school.
D.
Because it's for Lucy's birthday.
【单选题】Lucy and Jane are ____ Class Two. They are ____ the U.S.A. [ ] A. from; in
B.
in; from
C.
to; from
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