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【单选题】
典型21-三体综合征儿童的临床表现不包括( )A.
眼裂小，眼距宽
B.
掌
C.
鼻梁低平，外耳小
D.
颈部细长
E.
张口伸舌，流涎多
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【简答题】On entering college， Nijay Williams had no idea how challenging college education was． 查看材料
【简答题】College is a lifetime investment (投资) — the gift of a college education can open the door to a world of opportunity for your child or grandchild. Savings（储蓄）, even not so many at a time, can make a bi...
【单选题】What is the trend for college education?
A.
Students have increasingly shouldered tuition cost.
B.
Students bet the study of humanities will lead to employment.
C.
Students seek for human betterment by receiving college education.
D.
Students see college education as a means for a better job.
【单选题】In this consumerist age, most parents______.
A.
regard college education as a wise investment
B.
place a premium on the prestige of the college
C.
think it crucial to send their children to college
D.
consider college education a consumer product
【单选题】不锈钢的特性及其切削性能
A.
经加热后属难加工材料，这是由于其单位切削力大，导热系数较小，因此切削温度高，刀具易磨损。
B.
切削加工性能良好，采用车、铣、钻、铰、镗等切削方法容易获得较高的加工精度和良好的表面质量。
C.
具有密度小、比强度高、热强度高、热稳定性好、抗腐蚀性好等优点，因此在飞机上的应用日趋广泛。
D.
很高的耐磨性，硬度、强度、熔点都很高，化学活性大，亲和性强，所以很难加工。
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