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【单选题】
载波通信的传输介质是电力线，微波通信的传输介质是（），光纤通信的传输介质是光导纤维（光纤）。A.
空气；
B.
电力电缆；
C.
光纤；
D.
通信电缆。
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反馈参考答案：
举一反三
【单选题】设u=cos(xy),则du=( ).
A.
-cos(xy)(ydx+xdy)
B.
-sin(xy)(ydx+xdy)
C.
cos(xy)(ydx+xdy)
D.
sin(xy)(ydx+xdy)
【单选题】Please don't hesitate to let me know _____ you need something. [ ]
A.
even though
B.
as though
C.
in case
D.
so that
【简答题】Even though Jenna was speeding，the police let her go with a _________（警告）
【单选题】设u=cos(xy),则du=( ).
A.
-cos(xy)(ydx+xdy)
B.
cos(xy)(ydx+xdy)
C.
-sin(xy)(ydx+xdy)
D.
sin(xy)(ydx+xdy)
【单选题】________ everybody is present and everything is ready , let’s begin our party .
A.
Though
B.
Even though
C.
Now that
D.
Unless
【单选题】Though every parent admits that reading contributed to _________ better mind of their child, yet let’s face it, who has got _________ time?
A.
a; the
B.
a; /
C.
the; the
D.
the; /
【单选题】设u=cos(xy),则du=( ).
A.
-sin(xy)(ydx+xdy)
B.
-cos(xy)(ydx+xdy)
C.
cos(xy)(ydx+xdy)
D.
sin(xy)(ydx+xdy)
【单选题】Though every parent admits that reading contributes to better mind of their child, yet let’s face it, who has got time?
A.
a; the
B.
a; /
C.
the; the
D.
the; /
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