对钢来说,C=()的铁碳合金称为钢。
A.2.11%~6.69%
B.0.0218%~2.11%
C.4.3%~6.69%
参考答案:B
As we know, too much ________ to Xrays can cause skin burns, cancer or other damage to the body.
A.contact
B.appeal
C.exposure
D.contribution
灰苔常见于
A.表证
B.寒证
C.瘟疫
D.寒湿内阻
E.热极津枯