gi\u1ea3i m\u00e3 gi\u1ea5c m\u01a1<\/a>. Ng\u01b0\u1eddi ch\u01a1i s\u1ebd t\u00ecm ra nh\u1eefng quy lu\u1eadt xu\u1ea5t hi\u1ec7n c\u1ee7a c\u00e1c con l\u00f4, t\u1eeb \u0111\u00f3 d\u1ef1 \u0111o\u00e1n kh\u1ea3 n\u0103ng xu\u1ea5t hi\u1ec7n c\u1ee7a nh\u1eefng l\u00f4 n\u00e0o \u0111\u00f3 d\u1ef1a v\u00e0o k\u1ebft qu\u1ea3 c\u1ee7a nh\u1eefng ng\u00e0y tr\u01b0\u1edbc. N\u00f3i c\u00e1ch kh\u00e1c, ph\u01b0\u01a1ng ph\u00e1p b\u1ea1c nh\u1edb c\u00f2n \u0111\u01b0\u1ee3c hi\u1ec3u l\u00e0 vi\u1ec7c t\u00ecm hi\u1ec3u d\u1ea5u hi\u1ec7u c\u1ee7a m\u1ed9t chu k\u1ef3 \u0111\u1ec3 d\u1ef1 \u0111o\u00e1n l\u00f4.\u00a0<\/span><\/p>\nTh\u1ef1c ch\u1ea5t, c\u00e1ch ch\u01a1i l\u00f4 \u0111\u1ec1 theo b\u1ea1c nh\u1edb kh\u00f4ng qu\u00e1 cao si\u00eau, nh\u01b0ng n\u00f3 \u0111\u00f2i h\u1ecfi r\u1ea5t nhi\u1ec1u th\u1eddi gian. C\u00f3 nh\u1eefng chu k\u1ef3 ch\u1ec9 xu\u1ea5t hi\u1ec7n trong m\u1ed9t th\u1eddi gian ng\u1eafn. Nh\u01b0ng c\u0169ng c\u00f3 nh\u1eefng chu k\u1ef3 \u0111\u00f2i h\u1ecfi nhi\u1ec1u ng\u00e0y ho\u1eb7c th\u1eadm ch\u00ed l\u00e0 k\u00e9o d\u00e0i c\u1ea3 th\u00e1ng. Do \u0111\u01b0\u1ee3c t\u1ed5ng h\u1ee3p, \u0111\u00fac k\u1ebft qua nhi\u1ec1u n\u0103m th\u00e1ng, n\u00ean x\u00e1c su\u1ea5t tr\u00fang th\u01b0\u1edfng c\u0169ng kh\u00e1 cao.\u00a0<\/span><\/p>\n