三阀组与()送器配套使用,作用是将正、负压测量室与引压点导通或断开;或将正负压测量室断开或导通。
A、差压
B、温度
C、相对压力
D、绝对压力
参考答案:A
已知函数f(x)=2x+x,g(x)=log2x+x,h(x)=log2x-2的零点依次为a,b,c,则[ ]
A.a<b<c
B.c<b<a
C.c<a<b
D.b<a<c
The two men have been very intimate and reliable friends throughout their lives.