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【单选题】
耐酶青霉素的结构特点是侧链结构中含有A.
电负性原子
B.
较大的空间位阻基团
C.
水溶性的氨基
D.
脂溶性基团
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举一反三
【简答题】Foreign trade
【单选题】Why do many countries attach increasing importance to foreign trade?
A.
Because their economies depend highly on foreign trade.
B.
Because they want to keep foreign trade growing faster.
C.
Because foreign trade can increase the productivity of the industries.
D.
Because foreign trade creates jobs that have both political and economic significance.
【简答题】foreign trade
【简答题】下列各种说法中错误的是______（填序号） ①过一点有且只有一条直线与已知直线平行 ②在同一平面内，两条不相交的线段是平行线段 ③两条直线没有交点，则这两条直线平行 ④在同一平面内，若直线AB ∥ CD，直线AB与EF相交，则CD与EF相交．
【单选题】When a country runs a foreign trade deficit under a flexible foreign exchange rate system, its
A.
imports automatically increase
B.
exports automatically decline
C.
currency automatically depreciates
D.
currency automatically appreciates
【判断题】Traditional foreign trade is increasingly favorable to the business development of small and medium foreign trade companies.( )
A.
正确
B.
错误
【单选题】Foreign trade
A.
allows a country to have a greater variety of products at a lower cost than if it tried to produce everything at home.
B.
allows a country to avoid trade-offs.
C.
makes the members of a country more equal.
D.
increases the scarcity of resources.
E.
is none of the above.
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