【单选题】Pilots should contact _________ or their departure airport control tower if they need to change their departure time.
B.
the departure controller
【判断题】维生素K是一类具有凝血作用、含有甲萘醌结构特点的维生素
【多选题】下列叙述中,哪些符合维生素E的性质
E.
侧链上有4个双键,其中全反式异构体的活性最强
【单选题】汉译英:“原产地;有效期限”,正确的翻译为( )。
A.
place of issue Departure time
B.
place of origin Departure time
C.
place of issue Valid period
D.
place of origin Valid period
【单选题】The insurance shall be ()from the time of the engineer’s departure from China up to the time of his arrival in China on return.
【单选题】对维生素K的促凝血作用具有阻断作用的药物是()