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【多选题】
欲使 JK 触发器按 = 工作,可使 JK 触发器的输入端 ( ) 。A.
J=K=1
B.
J=Q,K=
C.
J= ,K= Q
D.
J=Q,K=1
E.
J=1,K=Q
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举一反三
【简答题】At that time food was scarce and of poor q______( 质量 ).
【单选题】下表为某同学做的灯电流的选择实验数据,则此空心阴极灯的灯电流应选择()。
A.
流/mA1.32.03.04.05.06.0
B.
.30.60.50.50.60.6 5.0Ma
C.
4.0mA
D.
1.3mA
E.
2.0mA
【单选题】Water is considered a scarce good because:
A.
. scarce goods are less expensive.
B.
. not enough of it is available for all needs.
C.
. not enough of it is available for all needs and because it is less expensive.
D.
. it does not have any uses.
【单选题】It is of vital importance that a person ______ at least both physically and mentally strong to be an astronaut(宇航员).
A.
shall be
B.
be
C.
are to be
D.
must be
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