题目内容
(请给出正确答案)
[单选题]
Xiao Ming wears a pair of glasses and always looks at people _____ his glasses.
A.through
B.on
C.thought
D.by
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A.through
B.on
C.thought
D.by
A.is worn
B.wears
C.wearing
D.are worn
温度为20℃,压强为Pa的空气密度为()kg/m3。
A.341
B.1.19
A.μ= 2 × 10 - 3 kg·mol – 1,气体为氢气
B.μ= 32 × 10 - 3 kg·mol – 1,气体为氧气
C.μ= 1 × 10 - 3 kg·mol – 1,气体为氢气
D.μ= 16 × 10 - 3 kg·mol – 1,气体为氧气