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【简答题】
斜方晶系具有三个相互垂直,但是三个不相等的结晶轴,即a ___ b ___ c,α ___ β ___ γ ___ 90°。
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反馈参考答案：
举一反三
【判断题】Historians believe the story of the American nation and its culture begins with the 1492 discovery of the new world by English explorer Christopher Columbus.
A.
正确
B.
错误
【单选题】Explorer Christopher Columbus landed in America, but he thought he ________ the East India.
A.
had discovered
B.
has discovered
C.
discovered
D.
was discovering
【单选题】下列关于门静脉的描述，哪项是错误的
A.
未阻断的情况下，门静脉压的正常值约在13～24cmH\r\n 2 \r\nO
B.
门静脉压力增高时首先出现的是交通支扩张
C.
门静脉主干是由肠系膜上静脉和脾静脉汇合而成
D.
门静脉与腔静脉之间的交通支最主要的是胃底、食管下段交通支
E.
门静脉无瓣膜
【判断题】Columbus Day is especially popular for Italian American because Christopher Columbus who first discovered America is an Italian explorer
A.
正确
B.
错误
【单选题】The American Continent was discovered by Christopher Columbus but was named after ________ another explorer.
A.
Marco Polo
B.
Christopher Columbus
C.
Ferdinand Magellan
D.
Amerigo Vespucci
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