回油孔式喷油泵循环供油量单调的方法是（）。A．拉动油门手柄 B．调节油泵齿条与油门拉

江苏洪泽县顺河镇内芒硝矿是华东唯一特大芒硝矿，已探明储量最高，且元明粉品位高、质量好，深受国内外客商青睐．元明粉是重要的化工原料，如图是某品牌元明粉包装袋上的部分标签．为测定该元明粉中Na₂SO₄含量是否符合标签要求，把15.0g样品（假设只含不溶性杂质）加入一定量的水溶解，过滤得100.0g滤液．取10.0g滤液，加入10%的氯化钡溶液20.8g，恰好完全反应．反应的化学方程式：Na₂SO₄+BaCl₂=2NaCl+BaSO₄↓．

（1）计算：10.0g滤液中Na₂SO₄的质量．

（2）根据这一次检测，计算15.0g样品中Na₂SO₄的质量分数．

（3）判断该样品Na₂SO₄的含量是否符合标签要求．

居住某市南区的唐某向本市电信局支付2000元初装费安装电话一部，2个月后，唐某发现话费单上出现自己从未打过的长途电话，话费150余元，遂找电信局交涉，经查系电信局设备技术故障所致，唐某多次要求电信局作进一步的解释并保证以后不再发生此类事情，电信局未予确认。不久，此类事情再次发生，唐某再次找电信局交涉，并要求电信局双倍返还多收的话费共计600余元。电话局遂派人到唐某所在单位，要求其单位领导做唐某的工作，让唐某不要再去电信局纠缠。此举引起唐某单位同事．邻居多人围观，议论纷纷，有人认为唐某意图趁机讹诈电信局。唐某甚怒，遂又找到电信局。电信局负责接待的人说："我们把多收的话费退给你，你不要，那你去法院告我们好了。你不是想要钱吗？开个价，10万．20万都可以。"唐某觉得羞辱无比，决意起诉电信局，请根据以上案情，回答下列问题：

唐某的诉讼请求中有拆机终止电话服务合同，退还初装费2000元的要求。电信局以上级主管部门有文件规定为由，只同意退还70％，对此应如何判断？

A．电信局应退还全部初装费

B．电信局应退还70％的初装费

C．如电信局承担多收的300元话费，则只退还70％的初装费

D．如电信局不承担多收的300元话费，则应退还全部初装费

铸造支托的厚度为（）。

A.0.5～0.9mm

B.1.0～1.5mm

C.1.6～2.0mm

D.2.1～2.5mm

E.2.6～3.0mm

“天不为人之恶寒也辍冬”（《荀子·天论》），句中“恶”的读音和意义各是什么？它另外有何音何义？

Vienna was one of the music centers of Europe during the classical period, and Haydn, Mozart, and Beethoven were all active there. As the (1) of the Holy Roman Empire (which included parts of present-day Austria, Germany, Italy, Hungary, Czech and Slovakia), it was a (2) cultural and commercial center (3) a cosmopolitan character. Its population of almost 250,000 (in 1800) made Vienna the fourth largest city in Europe. All three (4) masters were born elsewhere, but they were (5) to Vienna to study and to seek (6) . In Vienna, Haydn and Mozart became close friends and influenced each other’s musical (7) . Beethoven traveled to Vienna at sixteen to play for Mozart; at twenty-two, he returned to study with Haydn.

Aristocrats from all over the Empire spent the winter in Vienna, sometimes bringing their private (8) . Music was an important part of court life, and a good orchestra was a (9) of prestige. Many of the nobility were excellent musicians.

Much music was heard in (10) concerts where aristocrats and wealthy commoners played (11) professional musicians. Mozart and Beethoven often earned money by performing in these intimate concerts. The nobility (12) hired servants who could (13) as musicians. An advertisement in the Vienna Gazette of 1789 (14) : " Wanted, for a house of the gentry, a manservant who knows how to play the violin well. "

In Vienna there was also (15) music, light and popular in (16) . Small street bands of wind and string players played at garden parties or under the windows of people (17) to throw (18) money. Haydn and Mozart wrote many outdoor entertainment (19) , (20) they called divertimentos or serenades. Vienna’s great love of music and its enthusiastic demand for new works made it the chosen city of Haydn, Mozart and Beethoven.

4（）

A.great

B.brilliant

C.unique

D.classical