SP2型单元制动缸的活塞标准行程是（）。
A.12mm
B.14mm
C.16mm
D.18mm
参考答案：B
My mother lets me______ a lot of housework, and it makes me _____ sad.
A．do, free
B．to do, feel
C．do, feel
D．to do, to feel
短期贷款展期期限最长不超过（）
A.原贷款期限
B.3个月
C.6个月
D.9个月
