题目内容

Visual reference must be ________ at decision height if the pilot wishes to continue approach for landing.

A. required
B. acquired
C. inquired
D. requested

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Pilots may descend below DH once he has ______ missed approach procedure even if there is no visual reference.

A. initiated
B. terminated
C. started
D. established

In non-precision approach, the missed approach decision can be deferred to ______.

A. MDH
B. MDA
C. ADF
D. MAP

网络营销的外部环境可以分为广义和狭义两个方面来分析,广义的外部环境不包括

A. 政治环境
B. 法律环境
C. 经济环境
D. 企业环境

所谓( )其价值的大小主要取决于使用该服务的用户数量

A. 在线黄页
B. 搜索引擎
C. 网络推广工具
D. 网络销售