题目内容

345型链锯的电刷的作用（）。

A. 清除磁铁的灰尘
B. 导风散热
C. 支撑起动器
D. 排线作用

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下列哪一项是食管静脉曲张的X线特征性表现（）

A. 食管黏膜皱襞增宽、迂曲呈串珠样充盈缺损
B. 食管张力减低，管腔扩张
C. 蠕动减弱
D. 黏膜皱襞破坏、中断
E. 最初局限于食管下段

Many of the activities performed during the preliminary investigation are still being conducted in(1),but in much greater depth than before. During this phase, the analyst must become fully aware of the (2) and must develop enough knowledge about the (3)and the existing systems to enable an effective solution to be proposed and implemented. Besides the(4)for process and data of current system, the deliverable from this phase also includes the(5)for the proposed system.空白（1）处填（）

A. analysis phase
B. designphase
C. implementationphase
D. maintenancephase

我国证券结算采用分级结算制度。（）

A. 正确
B. 错误

用10ml大肚吸管移出溶液的准确体积应记录为10.0ml

A. 正确
B. 错误