测量误差按其产生的原因和对测量结果影响性质的不同可分为()。
A.人为误差
B.仪器误差
C.系统误差
D.偶然误差
E.粗差
参考答案:C, D, E
After five hours’ drive, they reached ______ they thought was the place they’d been dreaming of.
A.that
B.where
C.which
D.what
汽车ABS在紧急制动时有()种工作状态。
A.一
B.两
C.三
D.四