题目内容

A．monthB．yearC．weekD．day

A. month
B. year
C. week
D. day

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The young man______ in this company since he graduated from Madison College five years ago.

A. was working
B. has been working
C. works
D. worked

A．alsoB．yetC．alreadyD．thus

A. also
B. yet
C. already
D. thus

对10000只灯泡进行耐用性能测试，根据以往资料，耐用时间标准差为51.91小时，若采用重复抽样方法，概率保证68.27%，平均耐用时数的误差范围不超过9小时。在这种条件下应抽取34只灯泡进行耐用性能测试。

A. 正确
B. 错误

胰十二指肠切除术后患者，持续胃肠减压2周，腹胀，腹部无压痛，肠鸣音弱，心电图T波低平。最可能出现的体液代谢失衡类型是()E．