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【单选题】
扩大一阶测量系统的可用工作频率范围,其时间常数( )A.
越小越好
B.
越大越好
C.
与性能无关
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反馈参考答案：
举一反三
【单选题】下列表达式成立的是
A.
typeof NaN=="number"
B.
isNaN("abc")==NaN
C.
Number("123abc")==parseFloat("123abc")
D.
parseInt(12.5)==parseFloat(12.5)
【简答题】I had just started back for the house to change my clothes ________ I heard voices. A) as B) when C) after D) while
【单选题】电压源和电流源的等效变换公式为:
A.
I S = R 0 × U S
B.
I S =U S /R 0
C.
I S =R 0 +U S
D.
I S =R 0 -U S
【单选题】He left home ______a cold morning, and I heard that he was coming back _____ the late afternoon.
A.
in; on
B.
on; on
C.
in; in
D.
on; in
【单选题】I have heard a lot of good things about you __________I came back from abroad.A.since ##
A.
I have heard a lot of good things about you __________I came back from abroad. A.since
B.
until
C.
before
D.
when
【单选题】下列表达式成立的是:
A.
Object obj = new String("hello")
B.
Boolean flag=true;
C.
String s=new StringBuffer();
D.
Number n=new Integer(2);
【单选题】We can see the library between the post office the bank.
A.
but
B.
with
C.
or
D.
and.
【单选题】关于鳃器发生的叙述,哪项错误( )
A.
鳃弓为头部两侧的外胚层增生形成
B.
鳃沟为鳃弓之间的条形凹陷
C.
咽囊为内胚层向外膨出形成
D.
鳃膜是鳃沟与咽囊之间的薄膜
E.
鳃器参与颜面和颈的形成
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