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【多选题】
有些植物种子不能萌发是由于抑制物质存在于A.
胚
B.
种皮
C.
子叶
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举一反三
【单选题】Allowance for fresh water refers to（）.
A.
the provision to be provided when the vessel sails in fresh water area
B.
the fresh water to be carried by a vessel
C.
the allowance of fresh water for each crew member when in distress at sea
D.
the amount of free board decreased when sailing in fresh water area
【单选题】Which statement concerning the collection of fresh water is FALSE?
A.
Fresh water may be obtained from fish
B.
lifeboat covers or canopies should be washed with rain before drinking water is collected
C.
Fresh water may be collected from condensation inside the life-raft
D.
Freshwater cannot be produced from standing seawater
【单选题】The air here is ______ I can enjoy in my mountain village.
A.
not so fresh as that
B.
so fresh as
C.
as fresh as what
D.
so fresh as what
【单选题】通常的视力测试能够敏感地反映由于( )引起的视觉分辨能力下降。
A.
屈光不正导致的非离焦性模糊
B.
屈光不正导致的离焦性模糊
C.
视功能异常导致的非离焦性模糊
D.
视功能异常导致的离焦性模糊
【简答题】机械组织在植物体内起_______作用，其细胞的主要特点是_______，可分为_______和_______。厚角组织的细胞最明显的特征是_______，而且这种增厚是_______性质的；厚壁组织则具有均匀增厚的_______，且常木质化，根据其细胞的形态可分为_______和_______。
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