地层对比
参考答案：
指根据不同的场䟟或不同部面地层的各种属性的比较，确定地层单位盄圱层时廣地层位的对应啳系。
看图回答问题
A: What's that in English?
B: It's 1 2 .
A: And what are those?Are those buses?
B: No, 3 4 .They are 5 .
Expected noises are usually more _____ than unexpected ones of the like magnitude.
A．manageable
B．controllable
C．tolerable
D．perceivable
