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【单选题】
如 图所示 电路中网 1的网电流方程( ) 。A.
15I m1 － 5I m2 ＝ 6
B.
15I m1 ＋ 5I m2 ＝ 6
C.
15I m1 ＋ 5I m2 ＝－ 6
D.
15I m1 － 5I m2 ＝－ 6
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举一反三
【单选题】Inflation could co-exist with all of the following except______.
A.
an increase in the value of money
B.
a more unequal distribution of income
C.
falling unemployment
D.
rising real wages
【单选题】Which of the following is NOT true?
A.
The mothers' smoking during pregnancy could have affected the children's lungs.
B.
Doctors are sure that children whose mothers smoked developed 20% more colds, flu and other breathing diseases than other children.
C.
Doctors are sure when the mothers' smoking affected the children's lungs.
D.
Smoke-filled air at home could have affected the children's lungs.
【单选题】下列哪项不是臭氧的抗感染机制（）
A.
臭氧能拮抗炎症因子的释放、扩张血管、改善血流、减轻局部的渗出、水肿而发挥抗感染作用
B.
同时臭氧能抑制前列腺素、缓激肽及致痛复合物的合成与释放，中和白介素可溶性受体
C.
抑制干扰素，肿瘤坏死因子释放，增加81转移因子的释放
D.
臭氧能通过提高局部氧浓度发挥抗感染作用
E.
氧自由基在外周和脊髓均有致痛作用，而自由基清除剂如SOD、维生素E则可拮抗此致痛作用
【单选题】Which of the following could lead to moderate inflation?
A.
a negative supply shock
B.
a drop in consumer confidence
C.
a contractionary fiscal policy
D.
the pursuit of a balanced budget during an expansion
【单选题】The phrase 'susceptible to' in Para. 2 could best be replaced by' ______'.
A.
aware of
B.
affected by
C.
accustomed
D.
prone to
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