题目内容

坚持党的基本路线不动摇,关键是坚持()

A. 四项基本原则不动摇
B. 改革开放不动摇
C. 以经济建设为中心不动摇
D. 社会主义本质不动摇

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可用于制备亲水凝胶型骨架片的材料是

All of the following are determinants of demand except______.

A. price
B. tastes
C. supply
D. price of other goods

选择性胃迷走神经切断术

The addition to total variable cost when one more unit of output is produced is called______.

A. total cost
B. marginal cost
C. fixed cost
D. average variable cost