It smells sweet, just _____________ candy.[ ]
A. look
B. like
C. in
D. as
答案:B
We all feel it is Jack as well as his wife that ______ for their son’s bad performance at school.
A.are to blame
B.is to be blamed
C.are to be blamed
D.is to blame
如题23图所示半开阀门,阀门前后的测压管水头差为△h=1m水柱,管径不变,管中平均流速v=2m/s,则该阀门的局部阻力系数ξ为()。
A.4.9
B.6.1
C.3.4
D.4.2