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【单选题】
《危险化学品重大危险源监督管理暂行规定》对二级危险化学品重大危险源指标R值规定为()。A.
R≥100
B.
100>R≥50
C.
50>R≥10
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反馈参考答案：
举一反三
【单选题】_______ I paid a visit to this scenic spot, I was deeply attracted by its beauty.
A.
Firstly
B.
For the first time
C.
The first time
D.
At first
【简答题】计数器具有加计数器、减计数器、 三种类型
【单选题】_____ I toured Jiuzhaigou, I was deeply impressed with its beautiful scenery. [ ]
A.
For the first time
B.
At first
C.
It was the first time
D.
The first time
【单选题】I always think of books with unutterable feelings, being deeply indebted to them, as I am, for the warmth they have brought me.
A.
preferred
B.
mixed
C.
profound
D.
dissatisfied
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