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【单选题】
X线摄影利用的X线特性是A.
折射作用
B.
生物效应
C.
感光作用
D.
反射作用
E.
着色作用
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反馈参考答案：
举一反三
【多选题】使用示波器测试U341E型输入轴转速传感器波形时，下列说法正确的是 。
A.
输入轴转速即涡轮转速
B.
该传感器波形为交流波形
C.
正常工作时，发动机、车速越高，波形的周期短、幅值大
D.
输入轴转速能够达到发动机转速
E.
失速时波形的周期长、幅值小
【单选题】They became friends again that day. Until then.they_ to each other for nearly two years
A.
didn't speak
B.
hadn't spoken
C.
haven't spoken
D.
haven't been spoken)
【单选题】She never dreamed of _____ a chance for her to meet her old friends again. [ ]
A.
there being
B.
there to be
C.
there was
D.
being
【单选题】They became friends again that day. Until then they ______to each other for nearly two years.
A.
didn’t speak
B.
hadn’t spoken
C.
haven’t spoken
D.
haven’t been speaking
【单选题】使用示波器测试U341E型输入轴转速传感器波形时,下列说法错误的是( )。
A.
输入轴转速即涡轮转速
B.
该传感器波形为交流波形
C.
失速时波形的周期长.幅值小
D.
车速越高,波形的周期越短.幅值越大
【简答题】TCP/IP中,TCP的中文含义是:
【单选题】使用示波器测试U341E型输入轴转速传感器波形时，下列说法错误的是 。
A.
输入轴转速即涡轮转速
B.
该传感器波形为交流波形
C.
失速时波形的周期长、幅值小
D.
正常工作时，发动机、车速越高，波形的周期短、幅值大
【单选题】They became friends again that day , Until then, they to each other for nearly two years
A.
didn’t speak
B.
haven’t spoken
C.
hadn’t spoken
D.
haven’t been speaking
【单选题】They became friends again that day. Until then, they _____ to each other for nearly two years.
A.
won't speak
B.
haven't spoken
C.
hadn't spoken
D.
haven't been speaking
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