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【单选题】
制图时常用的中粗实线线宽( )。
A.
0.25b
B.
1b
C.
1.5b
D.
0.7b
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【单选题】元素的原子结构决定其性质和在周期表中的位置。下列叙述正确的是
A.
多电子原子中,在离核较近的区域内运动的电子能量较高
B.
原子核外电子的数目越多,电子的运动状态就越多
C.
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D.
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【多选题】My Favorite Hobbies I enjoy three hobbies in my free time. My first hobby is playing with my two-year-old son. I especially like to teach him new words. He listens very carefully to me and copies what...
A.
He listens very carefully to me and copies what I say.
B.
Unfortunately, the ball makes the neighbor’s dog bark.
C.
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D.
My son sits beside me, and sometimes we laugh until the tears come.
E.
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F.
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【单选题】下列物质的用途,主要由物理性质决定的是
A.
氢气做火箭的燃料
B.
浓硫酸做干燥剂
C.
二氧化碳做温室肥料
D.
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【单选题】二氧化碳的下列用途,只用到其物理性质的是(  )
A.
灭火
B.
做温室肥料
C.
制造汽水
D.
干冰用于人工降雨
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