a)相关论文
We identify 225 filaments from an H2 column density map constructed using simultaneous 12CO,13CO and C18O(J=1-0) observa......
1.算式21+2+3−(21+22+23)的值是多少?(A)0(B)50(C)52(D)54(E)57解直接计算,原式=64−(2+4+8)=50,故(B)正确.2.在何种条件下式子√......