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(一)何时用正体 1、所有计量单位、词头和量纲符号。计量单位如:m(米),V(伏),eV(电子伏)等;词头如:k(千),G(吉)等;量纲如:J(发光强度)等。 2、数学公式中的运算符号、缩写号和函数符号。运算符号如:∑(连加),Π(连乘),d(微分),α(偏微分),△(有限增量)等;缩写号如:min(最小),sup(上确界),lim(极限),det(行列式),T或t(转置符号)等;指数、对数、三角、双曲、反双曲、复数等函数符号如:exp(指数函数),ln(自然对数),sin(正弦),sinh(双曲正弦),Re(复数的实部),Im(复数的虚部)
(A) when to use the body 1, all units of measurement, prefix and dimension symbols. Units of measurement such as: m (m), V (volts), eV (eV), etc .; prefix such as: k (thousand), G (Kyrgyzstan); dimensions such as: J (luminous intensity) and so on. 2, math formulas in the operation symbols, abbreviations and function symbols. Operator symbols such as: Σ, Π (even multiply), d (differential), α (partial differential), △ (finite increment), etc .; abbreviations such as: min, sup, , lim (limit), det (determinant), T or t (transpose), etc .; exponential, logarithmic, trigonometric, hyperbolic, inverse hyperbolic, complex and other function symbols such as: exp (exponential function), ln ( Natural logarithm), sin (sine), sinh (hyperbolic sine), Re (real part of complex number), Im (imaginary part of complex number)