能引起较严重贫血的疟疾是()
A.间日疟
B.三日疟
C.卵形疟
D.恶性疟
E.输血后疟疾
参考答案:D
A distress signal().
A.consists of 5 or more short blasts of the fog signal apparatus
B.may be used separately or with other distress signals
C.consists of the raising and lowering of a large white flag
D.is used to indicate doubt about another vessel's intentions
工程开工前监督准备工作包括()。
A、审查勘察设计图纸
B、确定质量监督工程师
C、制定质量监督工作方案
D、检查工程建设各方主体质量行为