高比转数离心泵不具备（）特点。A．叶形“短宽”，叶片呈“扭曲形” B．扬程相对较低，

遗留某些后遗症的机制是()

A.正盛邪退

B.邪去正虚

C.邪盛正虚

D.邪正相持

E.正虚邪恋

用所给动词的适当形式填空。

1. Tony often ______ (go) online at weekends.

2. ______ his brother often ______ (play) computer games?

3. Mary and her sister ______ (send) emails on the computer but they ______ ______ ( not play )

    games on it.

4. First, use the mouse ______ ______ (click) "new document".

5. His father ______ ______ (not watch) TV every evening but he often ______ (write) novels on his

    computer.

集团客户的信用风险具有以下明显特征：（）

A、内部关联交易频繁

B、连环担保十分普遍

C、财务报表真实性差

D、系统性风险较高

E、风险识别和贷后管理难度大

下列苷可被碱水解的是（）

A.碳苷

B.酯苷

C.酚苷

D.醇苷

E.烯醇苷

在很多事故中，（）是造成事故的间接原因，但却是本质的原因。

A、人因

B、物因

C、管理原因

D、人因和物因