If you install a new hydraulic hose in a hydraulic system, the hose must be long enough to allow for contraction to prevent
A.failure of the hydraulic hose
B.excessive flow through the line
C.friction in other areas of the hydraulic system
D.overheating of the hydraulic fluid
第1题:
A:I haven't eaten all day.
B: You __ be very hungry.
A. should
B. have to
C. must
第2题:
A.Must; needn’t
B.Can; can’t
C.May; mustn’t
D.Can; mustn’t
第3题:
3.—__________ 1 go out for a while?
—No,you __________ You must finish your homework first.
A. Must,needn't
B. Can,may
C. May,mustn't
D. May,must
第4题:
A: I haven't sat down all day.
B: You _____be very tired.
A. could
B. have to
C. must
第5题:
A.byte
B.long
C.char
D.float
E.Short
F.Long
第6题:
第二类驱动阀门:借助手动、电动、液动、气动来操纵动作的阀门。如闸阀,截止阀、节流阀、蝶阀、球阀、旋塞阀等。Class ii drive valve: manual, electric, hydraulic, pneumatic to control the action of the valve. Such as gate valves, globe valves, throttle valves, butterfly valves, ball valves, plug valves and so on.