一列火车挂了10节车厢。其中9节各有118个座位，另外一节有60个座位。这列火车

某元素的原子结构示意图为

，该元素的原子核内有______个质子，最外电子层上有______个电子，该元素是______．该元素的单质在氧气中燃烧的现象是______．该反应的化学方程式是______．

42÷3.3的商用循环小数表示是______，读作______．

16．－Governments at all levels have to take measures to improve the quality of basic education.

－Exactly. _________, students' homework must be greatly reduced.

A．That's to say

B．What's more

C．Believe it or not

D．In a word

投资者缴纳基金认购款项时，基金合同成立。( )