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举一反三
【单选题】Part ADirections: Read the following four texts．Answer the questions below each text by choosing A, B, C or D．(40 points)The long year of food shortage in this country have suddenly given way to appar...
A.
The abundant food supply is not expected to last
B.
Britain is importing less food
C.
Despite the abundance, food prices keep rising
D.
Britain will cut back on its production of food
【单选题】除哪项外，有下列情况者均不能献血（）。
A.
性病、麻风病和艾滋病患者及艾滋病病毒感染者
B.
同性恋者、多个性伴侣者
C.
有吸毒史者
D.
阑尾切除手术后
E.
各种恶性肿瘤及影响健康的良性肿瘤患者
【多选题】已知∮＝R(r)(θ)Ф(∮)＝R(r).y(θ，∮)，其中各函数皆已归一化，则下列各式中，成立的是( )。
A.
∫｜∮｜2dτ＝∫R2r2dr
B.
∫｜∮｜2dτ＝∫4πr2∮2dr
C.
∫｜∮｜2dτ＝∫4πr2R2dr
D.
∫｜∮｜2dτ＝
Y2sinθd∮dθ
此题为多项选择题。
Y2sinθd∮dθ此题为多项选择题。
【单选题】The long year of food shortage in this country have suddenly given way to apparent abundance. Stores and shops are choked with food. Rationing (定量供应 ) is virtually suspended, and overseas suppliers ha...
A.
the fall in world food prices would benefit British food producers
B.
an expansion of food production was at hand
C.
British food producers would receive more government financial support
D.
it looks depressing despite government guarantees