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【单选题】
产生低频正弦波一般可用（ ）振荡电路A.
RC
B.
LC
C.
石英晶体
D.
RL
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反馈参考答案：
举一反三
【简答题】Radio was the pilot’s only means of (communicate) __________.
【简答题】编程:定义整型变量 x ,实现每次单机窗体时,都为 x 随机赋予 1 至 100 (含 100 )整数,并在窗体输出。
【单选题】Radio was the pilot's only ______.
A.
mean of communication
B.
means of communication
C.
mean of talking
D.
means of talking
【单选题】（）contains the wheelhouse with the control station,the chartroom where charts,pilot books and publications are kept,and the radio room.
A.
The doube bottom
B.
The cofferdam
C.
The navigating bridge
D.
The superstucture
参考解析：
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