如果孕妇出现呕吐的困扰,可暂时改变饮食的方式,如少量多餐、少吃油腻和不易消化的食物,多吃新鲜蔬果。
参考答案:对
在工程网络图中,工作K的最迟完成时间为第20天,共持续时间为6天,该工作有三项紧前工作,它们的最早完成时间分别为第8天、第10天、第12天,则工作K的总时差为( )天。
A.8
B.6
C.4
D.2
The number of people in the world ________ about 6 billion and large quantities of waste ________ each year.[ ]
A.totals; has been produced
B.totals; is produced
C.totals; are produced
D.total; are being produced