C125M33-2RH离心式压缩机的电流低限值是防止压缩机()。
A.超温
B.超电流
C.喘振
D.超压
参考答案:C
酒精监测仪中的反应原理为:C2H5OH+4X(红色)+ 6H2SO4 = 2Cr2 (SO4)3(绿色) + 2CO2↑+ 9H2O,则物质X的化学式为
A.CrO3
B.Cr2O3
C.Cr2S3
D.CrSO3
He________a dollar bill in the suit he was sending to the cleaner’s.[ ]
A.came to
B.came out
C.came across
D.came up