— ________ is it from here to your school?
— Ten minutes' walk.
A:How long
B:How about
C:How far
D:How
淮安市某盐化厂生产的碳酸钠粗产品中含有少量氯化钠.碳酸钠和氯化钠的溶解度与温度的关系如图所示,回答下列问题:
(1)t1℃时碳酸钠与氯化钠中溶解度较大的物质是____ .
(2)t1℃时碳酸钠溶液升温至t2℃,所得溶液的溶质质量分数____ .(填“变大”、“变小”或“不变”).
(3)除去碳酸钠中混有少量氯化钠的方法是____ .
—Where is Mrs. Smith?
—She isn't here. She ________ to England.
It's seven o'clock. My family breakfast.
与角﹣π6终边相同的一个角是( )