超低空微型遥感平台主要指飞行高度或滞留高度小于( )m,能装载轻型传感器的各种微型飞行器。
A.400
B.300
C.500
D.600
参考答案:C
子宫腔内回声增强不见于()。
A.子宫腺肌症
B.妊娠物残留
C.内膜息肉
D.内膜肿物、增生
E.子宫肥大
----Now that you like the house with a garden, why not buy it?
----Well, I can’t afford _____ house at present.
A.that expensive a
B.a such expensive
C.that an expensive
D.a so expensive