关元是哪几经的交会穴()。
A.任脉
B.冲脉
C.肾经
D.脾经
E.胃经
参考答案:A, C, D
—What were you doing when she dropped in?
—I for a while and_________ some reading.
A.was playing; was going to do
B.played; did
C.had played; was going to do
D.had played; did
工作中发现起重机故障时应采取()措施。
A、及时与安全维护人员联系
B、切断总电源
C、司机冷静检查
D、操作手柄回零位