第14题: [单项选择]( )在呼吸道可被阻留。 A. 荷电的尘粒 B. 易溶的尘粒 C. 硬尘粒 D. 分散尘粒 参考答案:A 答案解析:高分散度的尘粒通常带有电荷,与作业环境的湿度和温度有关。尘粒带有相异电荷时,可促进凝集、加速沉降。粉尘的这一性质对选择除尘设备有重要意义。荷电的尘粒在呼吸道可被阻留。
第21题: [单项选择]A client has just finished his glucose tolerance test. How many hours should it take for his blood glucose level to return to normal A. 2 hours. B. 3 hours. C. 5 hours. D. 6 hours. 参考答案:B 答案解析:The blood glucose level should return to normal within 3 hours. Some hypoglycemia (a less than norma