急性脑血管病变（除蛛网膜下腔出血外）首选的检查项目是（）。
A.头颅CT
B.心电图
C.肝功能
D.B超
E.MRI
参考答案：A
Often, when he ______ something that ______ him, he wasted his time drawing some little pictures.
A．should be doing; gave
B．should have been doing; was given
C．should do; was given
D．should have been doing; had given
利用起动设备将电压适当()后加到电动机定子绕组上进行起动，待起动完毕后，再使电压恢复到额定值，这叫降压起动。
A、提高
B、降低或提高
C、降低
D、调整
