接收开路电视信号一般用（）天线
A.引向天线
B.鼠笼天线
C.抛物面天线
D.风筝天线
参考答案：A
The police recommended that the ________ in the accident ____________ to the hospital nearby at once.
A．injure; should be sent
B．injuring; send
C．injured; be sent
D．injured; should send
控制复杂结构件焊接变形的焊后热处理方法是（）。
A、正火
B、淬火
C、退火
D、高温回火
