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
