单吸式离心泵叶轮工作时，叶轮两侧不对称，（）不一样。
A.离心力
B.向心力
C.压力
D.阻力
参考答案：C
The teacher told us that light _____ much faster than sound. [ ]
A travels
B. traveled
C. was
D. willbe
用HCl滴定NaOH时，记录消耗HCI溶液体积正确的是
A．24.1mlB．24.100mlC．24.10mlD．24.1000mlE．24ml
