食品中的干货、罐头、米面等放置仓库中贮存,湿度控制在()。
A.10-20%
B.20-30%
C.40-50%
D.50-60%
参考答案:D
3.They see you as something of a worrier,_______ problems which don’t exist and crossing bridges long before you come to them.
A.settling
B.discovering
C.seeing
D.designing
开胸手术麻醉中行控制呼吸,可引起()
A.通气与血流比值减少
B.通气与血流比值先减少后增大
C.通气与血流比值不变
D.通气与血流比值先增大后减少
E.通气与血流比值增大