不定项选择

‌地铁车站的换乘形式主要有垂直换乘和水平换乘两种。‌

A．正确
B．错误

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单项选择题

单项选择题

Under normal operating conditions，the rudder is hydraulically locked unless ______．A.The manual trick wheel is engaged for steeringB.The variable stroke pump is off strokeC.A rudder order is given by the control systemD.An electric power system failure occurs at the steering gear

A.A.The
B.The
C.A
D.An

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