0ne of your crew members falls overboard from the starboard side. You should immediateiy().
A. apply left rudder
B. throw the crew a life preserver
C. begin backing your engines
D. position your vessel to windward and begin recovery
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按适当的顺序,列出将一种mRNA的cDNA克隆到表达载体所用到的酶有哪些?
一般检修和大修197726型无轴箱滚动轴承压装后其轴向游隙限度为()mm。
A. 0.05~0.5
B. 0.075~0.54
C. 0.07~0.55
D. 0.08~0.6
肝胃蕴热可见()
A. 口淡乏味
B. 口甜而粘腻
C. 口苦
D. 口中泛酸
E. 口中酸馊