螺纹道钉硫磺锚固中使用的硫磺,其纯度应在()以上。
A.85%
B.90%
C.95%
D.98%
参考答案:C
------Do you want another piece of cake ?
------______.
A.I don’t think so
B.No way
C.Not at tall
D.I wouldn’t say no.
欲用10kgNaHCO4配制10%的NaHCO4溶液,则需要水()kg。
A.95
B.105
C.90
D.100