整流器在单机输出最大功率不小于1500W时,其效率应不小于(),功率因数应不小于()。
A、80%、0.8
B、80%、0.9
C、85%、0.9
D、90%、0.8
参考答案:C
Most of us found _____ hard to finish the work in such a short time.
A.it
B.that
C.which
D.this
下列各项,不属肺胀痰蒙神窍型主症的是()
A.神志恍惚
B.谵妄,烦躁不安
C.咳逆喘促
D.咳痰不爽
E.头昏而瞆