疼痛是牙髓炎的突出症状，医师应注意询问（） A.刺激因素 B.性质 C.部位

下列物质可用作复合肥料的是 ( )

A．NH₄HCO₃

B．KNO₃

C．Ca₃(PO₄)₂

D．K₂SO₄

植树节期间，四年级植树210棵，五年级植树280棵，五年级比四年级多植百分之几？（百分号前保留一位小数）

10÷7的商用循环小数的简便记法表示是______，商的小数部分第100位上的数字是______．

简述气相色谱法测定空气中甲醇时，样品的采集方法。

A client with chronic obstructive pulmonary disease (COPD) and cor pulmonale is being prepared for discharge. The nurse should provide which instructions（）

A. "Weigh yourself daily and report a loss of 1 lb in 1 day. "

B. "Eat a high-sodium diet. "

C. "Weigh yourself daily and report a gain of 2 lb in 1 day. "

D. "Maintain bedrest. "