On a voyage from Halifax,N.S.,to Dakar,West Africa,the Canary Current will （）.
A. set the vessel to the left
B. set the vessel to the right
C. offer resistance in the form of a head current
D. furnish additional thrust in the form of a fair or following current
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什么是抗原提呈细胞，体内主要有哪些，分布在何部位？
下面属于遥测量的设置属性有（）
A. 死区
B. 上限值
C. 下限值
D. 人工置数
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