在三极管的输入特性曲线中,锗管的死区电压约为()左右。
A、0.3V
B、0.1V
C、0.2V
D、0.5V
参考答案:B
急性疼痛对机体的影响,下列正确的是()
A.心率血压降低
B.活动减少,耗能减少
C.低血糖
D.机体水钠潴留
E.胃肠道功能亢进
Multiple fire pumps may be used for other purposes provided that one pump is().
A.on line to the fire main
B.kept available for use on the fire main at all times
C.capable of being connected to the fire main
D.rated at or above 125 psi