Which of the following will be the advantage of a centrifugal pump as compared with a reciprocating pump? l.Its discharge is continuous; ll.It has no internal valves: lll.Upon accidental closing of discharge valve, excessive pressure will not build up()
A.l, ll
B.ll, lll
C.l ,ll.III
D.llonly
第1题:
________ with flying, taking the train seems to be safer.
A: Comparing
B: Compared
C: Compare
D: To compare
第2题:
A. involve
B. relate
C. compare
D. connect
第3题:
第4题:
A、state
B、force
C、compare
D、welfare
第5题:
Michael’s new house is like a huge palace, ______with his old one.
A. comparing B. compares
C. to compare D. compared
第6题:
CRRT清除水和溶质主要方式不包括
A.弥散(diffusion)
B.对流(convection)
C.吸附(adsorption)
D.离心(centrifugal)