急性粒细胞性白血病时,在骨内,骨膜下或其他器官,白血病细胞形成瘤结,外观呈绿色称为:()
A.白色瘤
B.黄色瘤
C.绿色瘤
D.棕色瘤
E.转移瘤
参考答案:C
More teens are smoking in Beijing, ______ the number of primary and middle school students picking up the habit has more than doubled from previous years.
A.which
B.when
C.where
D.that
关于电力变压器能否转变直流电的电压,()是正确的。
A、变压器可以转变直流电的电压
B、变压器不能转变直流电的电压
C、变压器可以转变直流电的电压,但转变效果不如交流电好
D、以上答案皆不对