多项选择题

核聚变的分类是：
A、惯性约束
B、速度约束
C、磁场约束
D、电场约束

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单项选择题

The assumption of diminishing returns in the Heckscher-Ohlin model means that, unlike in the Ricardian model, it is likely that _____________________.

A．countries will consume outside their production possibility frontier.
B．countries will not be fully specialized in one product.
C．comparative advantage will not determine the direction of trade.
D．countries will benefit from free international trade.

单项选择题

“一周双赛”或“一周一赛”的联赛制赛事期间训练，也是典型的赛间训练。（）

A．对
B．错