One of the main advantages of "Flextime" for workers is that they ______.
A. have a greater sense of duty
B. can avoid busy traffic
C. can get higher pay
D. can avoid working hard
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No matter where it is used, "Flextime" system has proved ______.
A. entirely effective
B. a complete failure
C. to be disliked by the employers
D. too difficult to carry out
已知函数f(x)具有任意阶导数，且f'(x)=[f(x)]2，则当n为大于2的正整数时，f(x)的n阶导数f(n)(x)是______．
A. n![f(x)]n-1
B. n[f(x)]n+1
C. [f(x)]2n
D. n![f(x)]2n
糖皮质激素诱发消化系统并发症的机制，下列论述哪一点是错误的：
A. 抑制胃粘液分泌
B. 刺激胃酸分泌
C. 刺激胃蛋白酶分泌
D. 降低胃肠粘膜抵抗力
E. 直接损伤胃肠粘膜组织
According to "Flextime" system workers need not ______.
A. work by the same timetable
B ) work all the weekdays
C. go to work at weekends
D. go to work in the early morning
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