Cross breeding（杂交育种）
Cross breeding（杂交育种）
相关考题：
We may draw a conclusion that_______during a war.A.the Red Cross only protects the woundedB.the Red Cross only helps prisoners of warC.the Red Cross only helps citizensD.the Red Cross helps all the people in need no matter which side they are fighting for
跨境电子商务的英文名称是（）。A、Cross-border CommerceB、Cross-border Electronic CommerceC、Cross-border Trade CommerceD、Cross-border Communication
下面哪些关于放样中Contour和Constant Cross Section选项的叙述是正确的？（）A、只有当选择Contour时，才能使用Constant Cross Section参数，如果没有选择Contour，则不能使用Constant Cross Section。B、在路径转弯处，Constant Cross Section自动产生光滑的转角。C、只有当选择Banking时，才能使用Constant Cross Section参数，如果没有选择Banking，则不能使用Constant Cross Section。D、当没有复选Contour时，截面图形之间相互平行。
单选题The resistance of a conductor varies （）Adirectly as its length and inversely as its cross-sectional areaBinversely as its length and directly as its cross-sectional areaCdirectly as its length and directly as its cross-sectional areaDinversely as its length and inversely as its cross-sectional area
单选题Breeding the hybrid offspring to fix desirable traits is called ______.Anaturally selectingBinbreedingCpedigree breedingDpure-breeding
单选题The ship（）the Atlantic to America next week.Ashall crossBshall cross toCcrossDsail cross