最有助于诊断的检查是
A.痰培养
B.结核菌素试验
C.痰找抗酸杆菌
D.痰找癌细胞
E.血酶联免疫吸附试验(ELIS
参考答案:C
海洋是一个巨大的资源库,我们可以从海水中提取食盐,并以此为原料制得具有广泛用途的烧碱.其制取的主要工艺流程如下:
(1)利用风吹日晒可以从海水中提取粗盐,风吹日晒的主要作用是______.
(2)要除去食盐水中混有的少量泥沙,操作方法是______.
(3)写出电解氯化钠溶液的化学方程式______.
(4)该化工厂将副产品氢气和氯气加以利用:氢气在氯气中燃烧生成氯化氢,氯化氢溶于水得到盐酸.写出氢气在氯气中燃烧的化学方程式:______,通过这个化学反应,你对燃烧的新认识是______.
It is implied in the passage that ______.
A.parents can never hope to teach their children new sounds
B.children no longer imitate people after they being to speak
C.even after they have learnt to speak children still enjoy imitating
D.children who are good at imitating learn new words more quickly