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【单选题】
二次谐波成像指：A.
探头接收频率呈发射频率的2倍
B.
探头发射频率呈接收频率的2倍
C.
整倍于基波频率的振动波
D.
低频发射高频接收的波
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】三相半波可控整流电路中,如果三个晶闸管采用同一组触发装置来触发, a 的移相范围是 _ ( )
A.
0 ° --90 °
B.
0 ° --60 °
C.
0 ° --120 °
D.
0 ° --150 °
【简答题】Uncle Wang works in a book shop in the middle of the city. The shop is not far from his home. It is about one kilometer away. So Uncle Wang seldom(很少)goes to work by bus. He usually goes bike there by...
【单选题】When he lived there, he ______go to that book shop at the corner with his girlfriend after work every day.
A.
would
B.
should
C.
had better
D.
Might
【单选题】When he lived there, he ______go to that book shop at the corner with his girlfriend after work every day.
A.
would
B.
should
C.
had better
D.
might
【简答题】Uncle Wang works in a book shop in the middle of the city. The shop is not far from his home. It is about one kilometer away. So Uncle Wang seldom goes to work by bus. He usually goes there by bike, s...
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