在铜棒、盐水、铅笔芯和塑料尺中，属于绝缘体的是______．

一辆汽车从甲地开往乙地早上6时20分出发，第二天下午4时10分到达乙地，这辆汽车一共行了多长时间？

诊断疟疾的最可靠的依据是

A．蛋白尿

B．转氨酶升高

C．血内查到疟原虫

D．间接荧光抗体试验阳性

E．血沉增快

How did the Olympic Games start In ancient Greece athletic festivals were very important and had p ________ (1). Originally the Festival was held in honour of .Zeus, the supreme god in Greek Mythology. Eventually the Olympian athletic festival had lost its ________ (2) and became an international event. No one knows exactly ________ (3) the Olympic Games go, but some scholars recorded date from 776 B.C.According to some scholars, at first the only Olympic event was ________ (4), called a stadium and that was the only event until 724 B.C. After that, other ________ (5) were added and sixteen years later in ________ (6) the pentathlon was added and wrestling became part of the games. This pentathlon was a five-event match which ________ (7) running, wrestling, leaping, throwing the discus, and hurling the javelin.The games were held ________ (8) and after an uninterrupted history of 1170 years, the games ________ (9) in A.D. 394, the Christian era, because of their pagan origin.It was over ________ (10) before there was another such international athletics gathering. In 1896, the first of the modern ________ (11) opened in Athens, Greece.Nowadays, the Games are held in different countries ________ (12). The host country provides vast facilities such as stadiums and ________ (13).Many more sports are represented, including the very celebrated event: ________ (14).The Olympics start with the arrival in the stadium of a torch, ________ (15) on Mount Olympus by the sun’s rays. The torch is carried by ________ (16) to the stadium. The Olympic flame symbolizes the ________ (17) of the ancient Greek athletic ideals, and it burns throughout the Games until ________ (18). The well-known Olympic flag, however, is ________ (19): the five interlocking rings symbolize the uniting of all five continents ________ (20).

进行国际收支核算时，记录时间原则上应以常住单位和非常住单位交易双方的哪种时间为记录时间（）。

A.所有权变更

B.实物转移

C.协议

D.协商

生石灰块的吸潮率可达( )。

A．5%～10%
B．10%～20%
C．20%～25%
D．25%～30%
E．20%～30%