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【单选题】
设一阶系统的传递函数是 ,其阶跃响应曲线在 t =0处的切线斜率为( )。A.
7
B.
2
C.
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皮皮学刷刷变学霸
举一反三
【单选题】Yesterday evening, I was about to go to bed ______ you phoned me.
A.
when
B.
while
C.
as
D.
but
【单选题】I was about to go to bed _____ one of my old classmates made a call to me.
A.
that
B.
as
C.
while
D.
when
【单选题】I was about to go to bed _____ one of my old classmates made a call to me.
A.
when
B.
as
C.
while
D.
that
【单选题】以下不属于假兽药的是 。
A.
以非兽药冒充兽药或者以他种兽药冒充此种兽药的。
B.
兽药所含成分的种类、名称与兽药国家标准不符合的。
C.
国务院兽医行政管理部门规定禁止使用。
D.
成分含量不符合兽药国家标准或者不标明有效成分的。
相关题目：
【单选题】Yesterday evening, I was about to go to bed ______ you phoned me.
A.
when
B.
while
C.
as
D.
but