such learning takes place are so varied that it is【C6】______to explain
A. simple
B. natural
C. practical
D. difficult
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将“故远人不服,则修文德以来之;既来之,则安之”译成现代汉语,并说明孔子这句话所表达的观点。
According to Study 1, the reflectance of white S at a wavelength of 0.40 μm is closest to
A. 0.0
B. 0.1
C. 0.2
D. 0.3
下面()定额属于商业秘密,将成为市场竞争的主流。
A. 地区
B. 行业
C. 企业
D. 补充