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问题 单项选择题

采集江、河、湖等水样时，应将采样器浸入水面（）然后再拉开瓶塞，使水浸入瓶中。

A.5-10cm

B.10-20cm

C.20-30cm

D.30-40cm

答案

参考答案：C

单项选择题

单向板楼板是指板的长边与短边之比（）的楼板。

A.≥4

B.≥2

C.≦2

D.≦4
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单项选择题

A certain theater has 100 balcony seats. For every$2 increase in the price of a balcony seat above$10, 5 fewer seats will be sold. If a11 the balcony seats are sold when the price of each seat is$10, which of the following could be the price of a balcony seat if the revenue from the sale of balcony seats is$1,360 ？（）

A．$12

B．$14

C．$16

D．$17

E．$18
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