【判断题】只受两个力的作用而平衡的构件称为二力杆。由于二力杆的两个力必沿这两个力作用点的连线,所以二力杆不一定是直杆,也可以是曲杆或其他刚性杆件。()
【简答题】The gene they discovered today doesn’t all those cases. (account for)
【判断题】只受两个力作用而平衡的构件称为二力构件。由于二力杆的两个力必沿这两个力作用点的连线,所以二力杆不一定是直杆,也可以是曲杆或其他刚性构件。
【单选题】The gene for lactose utilization was inserted next to the gene under study and the new construct was transferred to a new host. The lactose gene was used as a
【简答题】基因调控(gene regulation or gene control)
【单选题】Many firms today use RFID technology to ________.
A.
identify new target markets
B.
analyze threats and opportunities in the macroenvironment
C.
move toward environmental sustainability
D.
track products through various points in the distribution channel
【单选题】Which is not housekeeping gene?
【判断题】只受两个力作用而平衡的构件称为二力杆。由于二力杆的两个力必沿这两个力作用点的连线,所以二力杆不一定是直杆,也可以是曲杆或其他刚性构件。