某卷带钢的内径为800mm，外径为1m，宽度为1.2m,求该卷带钢的总重量? （钢的比重=7.85t/m2）
危险化学品应当储存在专用仓库、专用场地或者专用储存室内，并由专人负责。
A. 正确
B. 错误
制作某种面包使用新鲜酵母4%，今因某种原因需改用快速即发酵母粉，其用量应改为（）
A. 4%
B. 2%
C. 1.6%
D. 2倍
A fog signal consisting of one prolonged blast followed by four short blasts would indicate thepresence of a（）.
A. vessel being towed
B. fishing vessel engaged in trawling
C. vessel at anchor warning of her location
D. power-driven pilot vessel on station underway
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