在廊桥活动端移动范围内应当采用（）线条设置廊桥活动区，禁止任

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问题单项选择题

在廊桥活动端移动范围内应当采用（）线条设置廊桥活动区，禁止任何车辆和设备进入。

A.黄色

B.红色

C.蓝色

D.白色

答案

参考答案：B

单项选择题

Following a year of fast development, by the first quarter of this year, China has had about 1,100 e-commerce websites.

A．China had about 1,100 e-commerce websites by the end of last March

B．by the end of the first quarter of this year, China has had about 1,100 e-commerce websites

C．by the end of this recent past March, China has about 1,100 e-commerce websites

D．by the end of this first quarter, China had about 1,100 or so e-commerce websites

单项选择题

西维因属于（）

A.氨基甲酸酯类农药

B.有机磷类农药

C.有机氯类农药

D.拟除虫菊酯类农药

E.有机砷类农药