盒形洞的基本特点,下列哪一条是错误的?()
A.洞底要平
B.线角要园钝
C.要有一定深度
D.应制备鸠尾扣
参考答案:D
下列关于邮政不承担赔偿责任的表述错误的是()。
A.不可抗力造成所有邮件的损失
B.所寄物品本身的自然损耗
C.寄件人的过错
D.收件人的过错
The force resulting from the earth’s rotation that causes winds to deflect to the right in the Northern Hemisphere and to the left in the Southern Hemisphere is called().
A.pressure gradient
B.Coriolis effect
C.aurora borealis
D.ballistic deflection