称样时试样吸取了少量水分属于（）误差。
A.系统误差
B.偶然误差
C.过失误差
D.绝对误差
参考答案：C
I refused his request, _________ that it was impossible to do it. [ ]
A. believed
B. to believe
C. convinced
D. to convince
电梯自动溜车的原因有哪些？
