更多"第三被洗出的是"的相关试题:
[单项选择]首先被洗出的是
A. 3，5，7-三羟基黄酮
B. 3，5-二羟基-7-O-葡萄糖基黄酮苷
C. 3，5，7，4’-四羟基黄酮
D. 3，5，4，-三羟基-7-O葡萄糖基黄酮苷
E. 3，5，7，3’，5’—五羟基黄酮
[单项选择]第五被洗出的是
A. 3，5，7-三羟基黄酮
B. 3，5-二羟基-7-O-葡萄糖基黄酮苷
C. 3，5，7，4’-四羟基黄酮
D. 3，5，4，-三羟基-7-O葡萄糖基黄酮苷
E. 3，5，7，3’，5’—五羟基黄酮
[单项选择]第四被洗出的是
A. 3，5，7-三羟基黄酮
B. 3，5-二羟基-7-O-葡萄糖基黄酮苷
C. 3，5，7，4’-四羟基黄酮
D. 3，5，4，-三羟基-7-O葡萄糖基黄酮苷
E. 3，5，7，3’，5’—五羟基黄酮
[单项选择]第二被洗出的是
A. 3，5，7-三羟基黄酮
B. 3，5-二羟基-7-O-葡萄糖基黄酮苷
C. 3，5，7，4’-四羟基黄酮
D. 3，5，4，-三羟基-7-O葡萄糖基黄酮苷
E. 3，5，7，3’，5’—五羟基黄酮
[单项选择]第三篇
Water
The second most important constituent (构成成份) of the biosphere (生物圈) is liquid water. This can only exist in a very narrow range of temperatures, since water freezes at 0℃ and boils at 100℃. Life as we know it would only be possible on the surface of a planet which had temperatures somewhere within this narrow range.
The earth’s supply of water probably remains fairly constant in quantity. The total quantity of water is not known very accurately, but it is about enough to cover the surface of the globe to a depth of about two and three-quarter kilometers. Most of it is in the form of the salt water of the oceans about 97 percent. The rest is fresh, but three quarters of this is in the form of ice at the Poles and on mountains, and cannot be used by living systems until melted. Of the remaining fractional which is somewhat less than one per cent of the whole, there is 10—20 times as much stored underground water as t
A. in the center of the earth.
B. on the surface of our planet.
C. in a very narrow range of temperatures.
D. in the coastal areas of the earth.
[单项选择]上颌第三磨牙
A. 下牙槽神经+舌神经+颊神经
B. 下牙槽神经+舌神经
C. 上牙槽前神经+鼻腭神经+腭前神经
D. 上牙槽后神经+腭前神经+上牙槽中神经
E. 上牙槽后神经+腭前神经
[单项选择]第三篇
Tightened Visa Regulations
According to South Korea’s new visa regulations, native speakers of English in South Korea will be required to undergo criminal record checks, medical and drug tests, provide sealed academic transcripts (成绩单)and have their university diplomas inspected, The Korea Times has reported The tightened regulations will affect an estimated 17,000 foreigners that hold E-2 visas-specifically for foreign language teachers.
The most controversial requirement is that English teachers residing (居住) outside South Korea will have to have an interview at a South Korean Embassy before taking up their teaching posts. For applicants living in remote areas in Canada, Australia or the US, this is an additional travel burden. Meanwhile, foreign teachers currently living in South Korea must leave the country after their one-year contracts and renew their visas by visiting a neighboring country and return without additional docume
A. protecting South Korea from terrorist attacks.
B. improving foreign language teaching in South Korea.
C. providing more job opportunities for the South Korean people.
D. encouraging the South Korean people to learn the Chinese language.
