多项选择题

In civil engineering, transportation, mining engineering, water conservancy and hydropower and other fields, the materials involved have （） and other characteristics. A. Species diversity B. scarcity C. Medium form pluralism D. The irregularity of geometric forms

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单项选择题

半抗原（）。 A. 可以诱导抗体生成，但不能与抗体特异结合 B. 可以与抗体特异结合，但不能诱导抗体生成 C. 可以诱导抗体产生，也可以与抗原特异结合 D. 不能与抗体特异结合，也不能诱导抗体产生

单项选择题

Other fundamental things equal, a decrease in the exchange rate value of the domestic currency will make domestic goods: ()

A．to be demanded more internationally.
B．less competitive in the international markets.
C．less expensive in the domestic market.
D．less expensive to produce.