筛分试验计算的三个参数是()、()和()。用()计算细度模数,用()评价砂的粗细程度。
参考答案:分计筛余百分率,累计筛余百分率,通过百分率,累计筛余百分率,细度模数
— Did Alice enjoy the concert held in Grand Theater yesterday?
— Yes, she did. She _____ such an excellent concert for a long time. [ ]
A. didn't take part in
B. wouldn't take part in
C. hasn't been in
D. hadn't been in
选择压力机合适的加载量程,一般要求达到的最大破坏荷载应在所选量程的( )之间。
A.50%左右
B.30%~70%
C.20%~80%
D.10%~90%