判断糖尿病控制程度的指标是
A．空腹血糖B．糖化血红蛋白C．尿糖D．胰岛素释放试验E．葡萄糖耐量试验
参考答案：B
造成非吸烟者在公共场所吸食“二手烟”的主要原因是
A．分子很小
B．分子在不断运动
C．分子之间有间隔
D．分子间有相互作用
The long-run production decision differs from the short-run production decision in that:（）
A. variable costs can be changed in the short run but not the long run.
B. variable costs can be changed in the long run but not the short run.
C. fixed costs can be changed" in the long run but not the short run.
