正常双眼眼压差异（）
A.10～21mmHg
B.≤5mmHg
C.≤8mmHg
D.＞5mmHg
E.＞8mmHg
参考答案：B
Scientists have already found problems that associated______living in the ocean are nearly the same as those of living in outer space.
A．to
B．of
C．with
D．at
土地勘测定界的特点包括（）。
A.专门性
B.滞后性
C.精确性
D.及时性
E.法律性
