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【单选题】
在疾病的流行中,一种容易被忽视的重要传染源是A.
急性期病人
B.
恢复期病人
C.
健康带菌者
D.
带菌动物
E.
患病动物
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皮皮学刷刷变学霸
举一反三
【简答题】徐变主要是由混凝土中______所引起的，它产生于______和______，故在其它条件相同时，水泥用量越多，徐变值______；水灰比愈大，徐变值越______。
【判断题】Many businesses have shifted their base to the newly developed areas now.
A.
正确
B.
错误
【简答题】Many businesses have been closed as aresult of the economic ________.A. er B. cr C. situation D. collapse
【简答题】Many businesses have replaced cash registers with point-of-sale (POS) terminals.
【简答题】Many businesses have because of the recession.
【单选题】Many businesses have been closed as a result of the economic ________.
A.
danger
B.
crisis
C.
situation
D.
collapse
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