酸奶不仅营养丰富,而且容易消化吸收,是一种优质的饮料.在酸奶的制作巾,起作用的微生物是( )
A.酵母菌
B.乳酸菌
C.醋酸菌
D.曲霉和毛霉
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Strange things happen to time when you travel, because the earth is divided into twenty - four parts, 1 a part. You can have days 2 more or fewer than twenty - four hours, and 3 with more or fewer than seven days. Your ship goes into 4 time part every day if you make a five - day journey across the Atlantic Ocean. As you go into each part, the time 5 one hour. Traveling west, you 6 your clock back; traveling east, you let it ahead. Each day of your jou rney has 7 twenty-five or twenty-three hours. If you travel by ship across the Pacific, you will 8 the International Date Line. This is the point where a new day _ 9 . When you go across the line, you change your calendar one 10 day, back or ahead. | ||||
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城市发展目标包括( )。
A.经济发展目标
B.环境保护目标
C.社会发展目标
D.文化发展目标
E.城市建设目标
卵巢性闭经不包括()
A.卵巢功能性肿瘤
B.卵巢切除
C.卵巢早衰
D.低促性腺激素性闭经
E.多囊卵巢综合征
高等学校学生身体发育已接近完成,可针对不同专业对身体的要求以及学生对体育的爱好,组织体育活动,并(),以进一步增强学生的体质。
为了保证电气设备和电力系统正常可靠地运行,而将电力系统中的某一点接地,称为()。
A.工作接地
B.保护接地
C.重复接地
D.保护接零