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问题 填空题

在三角形ABC中，A、B、C的对边分别为a，b，c记a=x，b=2，B=45°，若三角形ABC有两解，则x的取值范围是            .

答案

.

题目分析：如图，根据题意只需，解得.

单项选择题

When you think of the Internet, you probably think of ".com." Just what do those three letters at the end of a World Wide Web address mean Every computer that hosts data on the Internet has a (71) numerical address. For example, the numerical address for the White House is 198.137.240.100. But since (72) people want to remember long strings of numbers, the (73) was developed. It is a critical part of the Internet’s technical infrastructure, correlates a numerical address to a word. To (74) the White House website, you could type its numerical address into the address box of your web browser. But most people prefer to use "www.whitehouse.gov." In this case，the domain name is (75) .

（72）处填（）。

A．most

B．more

C．few

D．every
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单项选择题 A1/A2型题

关于牙钳使用，下列正确的是（）

A.钳喙应尽量向根方夹持

B.夹持不可太紧，否则易断根

C.多个牙拔除时尽量选用万能牙钳

D.手掌握持时应尽量靠近牙钳关节

E.使用牙钳只能唇（颊）舌（腭）向摇动，否则易断根
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