可以用作钢琴表面的聚酯漆的涂料增稠剂是因为含有哪种重要成分?()A、碳酸钙 B、白炭

题型:单项选择题

问题:

可以用作钢琴表面的聚酯漆的涂料增稠剂是因为含有哪种重要成分?()

A、碳酸钙

B、白炭黑

C、氧化铁

D、荧光粉

考点:材料科学材料科学与工程材料科学与工程题库
题型:单项选择题

远端机接收和发射光波长分别为()。

A、1550nm,1310nm

B、1310nm,1550nm

C、1550nm,1550nm

D、1310nm,1310nm

题型:单项选择题

《神华集团公司煤炭安装回撤单位本质安全管理考核评分标准》其他设备回撤规定,电气设备回撤时,严格按照井下停送电制度停电,由专职电工()确认断电后拆线。

A.挂牌

B.验电

C.放电

D.调整定值

题型:单项选择题

液压马达每转一周所排出的液体体积称为()。

A、流量

B、排量

C、容积效率

D、容积

题型:单项选择题

请问冲击负荷及波动负荷对电网有何影响?

题型:单项选择题

Part 4


Questions 26-45


·Read the following passage and choose the best word for each space.
·For questions 26-45, mark one letter A, B, C or D on the Answer Sheet.
Do you want to send an e-mail message to the White House
Good luck.
In the past, (26) President Bush — or at least those assigned to read his mail — what was (27) your mind it was necessary only to sit down at a personal computer connected to the lnternet and (28) a note to president@ whitehouse.gov.
But this week, Tom Matzzie, an online organizer with the A.F.L.-C.I.O., discovered that (29) with the White House had become a bit more (30) . When Mr. Matzzie sent an e-mail protesting (31) a Bush administration policy, the message was bounced back With an automated reply, saying he had to send it again in a new way.
Under a system (32) on the White House Website (33) the first time last week, those who want to send a message to President Bush must now (34) as many as nine Web pages and (35) a detailed form that starts by asking whether the message sender supports White House policy (36) differs with it.
The white House says the new e-mail system is an effort to be more responsive (37) the public and offer the administration "real time" access (38) citizen comments.
Completing a message to the president also requires (39) a subject from the provided list, then entering a full name, organization, address and e-mail address. (40) the message is sent, the writer must wait for an automated response (41) his message, (42) whether the addressee intended to send the message. The message is delivered to the White House only after the person using that e-mail address (43) it.
"Over (44) , it’s a very cumbersome process," said Jakob Nielsen, an authority on Web design. "It’s probably designed deliberately to (45) on their e-mail.\

A.and over

B.again

C.all

D.and above

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