一般情况下,每台锅炉至少应装设几个彼此独立的水位表()
A.2
B.3
C.4
参考答案:A
He’s aiming ________a prize. That is why he puts his heart ________ his work.
A.at; of
B.to; off
C.for; away
D.at; into
百粒重测定应随机数取试验样品10个重复,每个重复100粒。