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【单选题】
关于致病菌致病因素的描述,错误的是A.
细菌侵入数量与致病无密切关系
B.
膜、微膜与致病有关
C.
黏附因子与致病有关
D.
内、外毒素与致病有关
E.
细菌的胞外酶可致病
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举一反三
【简答题】集流(mass flow，bulk flow)
【单选题】The word 'excavating' in line 19 is closest in meaning to
A.
Living
B.
digging
C.
assembling
D.
building
【简答题】某钢筋混凝土屋架下弦杆,截面尺寸为200mm×160mm,配置4Φ16 HRB335级钢筋,混凝土强度等级为C40 。承受轴心拉力设计值为N=240kN。结构重要性系数为1.0。问此构件正截面承载力是否合格?
【单选题】The phrase of the year 2011, 'shang bu qi', ______ 'too delicate to bear a blow', reveals the public's sensitivity to personal and social problems.
A.
which mean
B.
meaning
C.
means
D.
whose meaning
【单选题】The two loops in the circular-flow diagram represent the flow of
A.
goods and the flow of services.
B.
dollars and the flow of financial assets.
C.
inputs and outputs and the flow of dollars.
D.
capital goods and the flow of consumer goods.
【简答题】______ is a measure of heat flow through a material. It relates heat flow (the flow of heat energy per unit area, per unit time) to the temperature gradient, causing the heat to flow. A) Heatcapacity ...
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