医院放射科X线机室必须制定完善的安全规章制度，其内容应包括（）。A、下班时必须切断电

American English has so many _________ because the American people have come from all over the world.

A．grammar

B．vocabulary

C．pronunciations

D．dialects

The 586 billion dollars economic stimulus package that China announced Sunday may not be quite as huge as it seemed at first sight, but it showed just how       the authorities in Beijing take the threat of a slowdown following the international financial crisis.

A．sincerely

B．happily

C．precisely

D．seriously

下列情况不是狭窄性腱鞘炎体征的是（）。

A.弹响指

B.弹响拇

C.扳机指

D.鼓槌指

E.握拳尺偏试验阳性

某地土壤受镉污染后，用石灰处理可以显著降低糙米镉的含量，其原理是（）

A.形成镉螯合物

B.改变镉的价态

C.形成难溶性氢氧化物沉淀

D.提高土壤对镉的吸附率

E.使镉成为易溶于水的化合物