在8086/8088的延长总线周期中，在（）之后插入Tw。
A.T1
B.T2
C.T3
D.T4
参考答案：C
The government has taken some measures to solve the shortage of electricity, but it may be some time
________ the situation improves.[ ]
A. since
B. when
C. unless
D. before
心肺复苏用药时的首选药物是( )
A．心三联(肾上腺素、去甲肾上腺素和异丙肾上腺素)B．肾上腺素C．异丙肾上腺素D．去甲肾上腺素E．利多卡因
