采用等中心方法,拍摄两张互相垂直的影象片,此种放射源的定位技术称为()
A.正交技术
B.立体平移技术
C.立体交角技术
D.立体斜交技术
E.旋转技术
参考答案:A
—He _______ to the meeting. Have you informed him of it?
—Sorry. I ________to.
A.hasn’t come; am going
B.didn’t come; have forgotten
C.hasn’t come; forgot
D.doesn’t come; will have
高温环境容易发生()情况。
A、窒息
B、中暑
C、昏迷