用滞留喷洒法喷洒氯氢菊酯杀灭苍蝇,每平方米用药一般为()毫克。
A.0.5
B.0.7
C.0.75
D.0.8
参考答案:A
—Have you got any idea why Mother asks for me?
—She wants you to________ your staying up last night.
A.search for
B.account for
C.wait for
D.say for
混凝土早期收缩占收缩量的大部分。施工时,每30~40m间距留出()㎜宽的施工后浇带,暂不浇筑混凝土,两个月后,混凝土收缩大约完成70%,再浇筑缝内混凝土,把结构连成整体。
A.700~1000
B.800~1000
C.800~1200
D.900~1000