易受湿度影响而变质的药品是()
A.维生素B12
B.酵母片
C.氢氧化铝
D.复方莪术油栓
E.葡萄糖酸钙
参考答案:B
离心泵在启动前,先向泵内充满液体,是为了()。
A、叶轮中心产生负压能吸入液体
B、运行安全性
C、提高泵效
D、提高扬程
An analyst stated that a univariate normal distribution is completely described by only two parameters, and a multivariate normal distribution is completely described by two parameters as well. Is the analyst correct with respect to a: Univariate normal distributionMultivariate normal distribution()
A. No No
B. No Yes
C. Yes No