检测据报道，科学家已成功合成了少量的O4，有关O4的说法正确的是

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问题选择题

检测据报道，科学家已成功合成了少量的O₄，有关O₄的说法正确的是

A．O₄的摩尔质量是64 g

B．相同质量的O₄与O₃所含原子个数之比为1∶1

C．O₄与O₂互为同位素

D．O₄与O₃、O₂都是氧元素的同分异构体

答案

答案：B

选择题

The bridge is ______. [ ]

A. long 3 kilometers

B. kilometers long

C. 3 kilometers long

D. 3 kilometer-long

单项选择题

Traditionally，the signal for fire aboard ship is（）.

A.more than 6 short blasts and 1 long blast on the whistle，and the same signal on the general alarm

B.continuous sounding of the ship's whistle and the general alarm for at least 10 seconds

C.1 short blast on the whistle

D.alternating short and long blasts on the ship's whistle