_____, some famous scientists have the q_爱下问搜题

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问题选择题

_____, some famous scientists have the qualities of being both careful and careless.

A．Strangely enough

B．Enough strangely

C．Strange enough

D．Enough strange

答案

答案：A

选择题

下列物质性质递变正确的是 [ ]

A．原子半径：C、Al、K依次增大

B．热稳定性：HF、NH₃、SiH₄依次增强

C．水化物的酸碱性：NaOH、Al(OH)₃、Mg(OH)₂碱性减弱

D．非金属性：Cl、P、S依次增强

单项选择题

全面规定两国之间经济和贸易关系的贸易条约和协定是（）

A.通商航海条约

B.贸易协定

C.贸易议定书

D.支付协定