公式： f(x)={xif x0α(ex−1)if x≤0
His comments, made last Friday, came after US Energy Secretary Chris Wright completed a two-day trip to Venezuela to see how the nation is starting to reopen its oil sector to US companies.
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It was a night that saw a serious escalation in violence between Afghanistan and Pakistan, with Pakistan launching airstrikes in Afghanistan - including its capital city, Kabul. Other places struck were in Paktia and Kandahar provinces, the latter a stronghold and the birthplace of the Taliban movement.
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