高血压伴左室肥厚，选择降压药物最佳方案是（）。
A.α1-阻滞剂
B.β-阻滞剂
C.利尿剂
D.血管紧张素转化酶抑制剂
E.钙拮抗剂
参考答案：E
Swimmers must be very strong in order to build up speed because of the high resistance of the water. Runners, ____, must struggle against the heavy resistance of the air and ground.
A．generally
B．similarly
C．naturally
D．probably
管路采样式吸气感烟火灾探测器调试时，逐一在采样管最末端（最不利处）的采样孔加入试验烟，采用秒表测量探测器的报警响应时间，探测器或其控制装置应在（）内发出火灾报警信号。
A.60s
B.100s
C.120s
D.150s
