如果3x-4y=0,(x、y都不为0)那么x与y______比例.
如果3x-4y=0,(x、y都不为0),则:3x=4y,即x÷y=43(一定),那么x与y正比例;
故答案为:正.
与CT比较,磁共振成像(MRI)的优点是()
A.图像清晰
B.层面连续
C.可区分肿瘤的性质
D.不用造影剂增强即能显示肿瘤的浸润范围
E.对骨组织病变显示好
An inflatable liferaft should be lifted back aboard the ship by using().
A.the single hook at the top of the raft
B.two lines passed under the raft
C.the towing bridle
D.All of the above