合面洞深应为
A.1mm
B.1~1.5mm
C.1.5~2mm
D.2.5mm
E.3mm
参考答案:C
Even students with intel1igence can be excellent students after bettering their study habits.
A.average
B.unusual
C.splendid
D.popular
单作用活塞泵的排出量是脉动的。