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问题 选择题

With a good ______ of both Chinese and English,she had an advantage over the other interviewees.[ ]

A.program

B.guidance

C.command

D.ability

答案

C

单项选择题

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet. Communicating via e-mail is by far the most common Intemet activity. You can （）with anyone in the world who has an Intemet address or e-mail （）with a system connection to the Internet. All you need is （）the Internet and an e-mail program. Two of the most widely used e-mail programs are Microsoft’s （） and Netscape’s Navigator. A typical e-mail message has three basic （）: header, message, and signature.

who has an Intemet address or e-mail（）with a system connection to the Internet.

A．account

B．No.

C．user

D．administrator
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单项选择题

在正常运行中，应维持炉膛负压（）。负压过大，会增加漏风，增大引风机电耗和排烟热损失；负压过小，容易喷火伤人，影响锅炉房整洁。

A.1～2mmH20

B.2～3mmH20

C.3～4mmH20

D.5～6mmH20
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