某施工项目在有放射性污染的环境中施工，则（）。 A.防护措施由发包人完成，费用也由发

设N_A为阿伏加德罗常数的值，下列有关叙述正确的是（　　）

A．1molCH₃⁺含有9N_A个电子

B．lmolNaHSO₄固体中含有阳离子的数目为2N_A

C．常温常压下，22.4L乙烯中含C-H键的数目小于4N_A

D．H₂O₂分解生成1mol氧气时有4N_A个电子发生转移

The mother of a 4-year-old asks about dental care for her child. "I help brush her teeth every day and her teeth look healthy. When should I take her to see a dentist" Which of the following responses would be most appropriate

A．"Because you help brush her teeth, there's no need to see a dentist right now. "

B．"Ideally she should have seen a dentist already, but it's still not too late. "

C．"Your child doesn't need to see the dentist until she starts school. "

D．"A dental checkup is a good idea even if no problems are noticeable. "

板蓝根可用于治疗（）。

A.外感发热

B.瘟毒发斑

C.咽喉肿痛

D.痄腮

E.丹毒

患者，女，小脑梗死，存在平衡功能障碍。

患者Berg平衡量表评分45分，提示（）

A.患者平衡功能差，需要乘坐轮椅

B.患者有一定的平衡能力，可在辅助下步行

C.提示患者平衡功能较好，可独立步行

D.提示患者有跌倒的危险

E.提示患者平衡功能完全正常

最简易易行的测量体成分的方法是（）。