称重衡器应保持准确,其校验期不超过()
A、三个月
B、六个月
C、十二个月
参考答案:A
I don’t like any humor in this serious speech because I can’t think of any circumstance ______ this would be beneficial or useful.
A.which
B.whether
C.where
D.as
烘焙甜面包时,若烤焙时间相同,烤炉温度太低会造成()
A.体积不变
B.底部颜色深
C.表皮颜色浅
D.组织细致