题目内容

在电网容量大、电动机的额定功率不太大的条件下常采用()。

A. 降压启动
B. 直接启动
C. 三角形启动
D. 星形启动

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Section A
Directions: This section is to test your ability to understand short dialogues. There are 5 recorded dialogues in it. After each dialogue, there is a recorded question. The dialogues and the questions will be spoken only once. When you hear a question, you should decide on the correct answer from the 4 choices A , B, C, and D.
(1)

A. He fixes bicycles.
B. He sells chairs.
C. He raises sheep.
D. He's a gardener.

The firms like Lehman Brothers believe that the prospects of American shares are______.

A. inspiring
B. unclear
C. disappointing
D. encouraging

下列哪项指标时补给钾盐

A. 25ml/h
B. 20ml/h
C. 30ml/h
D. 40ml/h

分离培养妊娠期龈炎患者的龈下菌斑中的细菌，优势菌为

A. 变形链球菌
B. 伴放线放线杆菌
C. 牙龈卟啉单胞菌
D. 中间普氏菌
E. 金黄色葡萄球菌